Sash-lock.



No. 878,883. PATBNTED FEB. 11, 1908.

J. G. KEITH. r SASH LOOK. APPLICATION imm 0012s. n05.

JOHN G. KEITH, OF CHICAGO, ILLINOIS.

SASH-LOCK.

Specification of Letters Patent.

Patented Feb. 11, 1908.

Application filed October 28, 1905. Serial No. 284u860.

To all whom it may concern:

Be it known that 1, JOHN G. KEITH, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Sash-Locks, of which the following is a specification.

My invention pertains to sash-locks for Windows and the preferred embodiment thereof includes a spring pressed locking bar ivoted within a recess or mortise in one or 0th of the stiles of the upper sash, its lower end being automatically forced outwardly by a spring housed in the mortise to engage a cooperating seat or block secured to top of the upper cross-bar or rail of the lower sash, and thereby lock the sashes against relative sliding movement. The upper end of the locking bar is curved on an arc concentric with the axis of its pivot and fits a correspondingly shaped recess in the top of the mortise, or, preferably, in a metal block between the up er end of the lever and the top of the mortlse. strain put upon the sashes by anyone attempting to pry up the lower sash by means of a bar, jimmy, or the like is transmitted through the locking bar to the stile of the upper frame in a direction nearly yertical and longitudinally of the locking bar and stile, so that my improved lock successfully and effectually withstands such attempts to open the locked sashes, whereas, sashes equip ed with locks secured to the adjacent crossars of the upper and lower sashes receive such strains transversely and are comparatively easily forced open because of the reaking of the lock itself or because of its tearing loose from the cross-bar. My novel lock is also provided with a spring catch, to retain the locking bar in its housing or mortise when one or both of the sashes are not in closed position to prevent a rubbing wear on the other sash; and the surfaces of the seat and cooperating end of the locking bar are eccentric relative to the axis of the pivot of the latter, this construction permitting an .automatic locking of the sashes together even though both are not fully closed. The seat is so placed on the lower sash that when both sashes are closed or substantially closed it retracts the retaining catch to free the locking bar which thereupon moves outwardly into operative or looking position.

The nature, characteristic features, and scope of my invention will be more fully By this construction theunderstood from the following description taken in connection with the accompanying drawing, forming part hereof, and in which Figure 1 is a fragmentary perspective view of a window equipped with the preferred embodiment of my invention in sash locks; and Fig. 2 is a vertical cross-section of the adj acent portions of the two sashes showing the sash lock.

The upper sash of which only portions of the glass 10, lower cross-bar or rail 11, and stile 12 are illustrated, is mortised or recessed at the lower end of the stile to receive a metallic frame or housing comprising face portions or flanges 13 screwed or otherwise secured to the surface of the stile, sides 14, and a back or connecting plate 15 Pivoted within this frame or housing near its upper end is a locking bar 15 of substantial width and thickness mounted. on a pintle 16 passing through the sides 1 1. The upper end of locking bar 15 is convexed on a curve concentric with the axis of its pivot 16 and neatly fits a recess 17 of the same shape in the underside of a preferably metal block 18 mounted in the mortise of the stile between the upper edges of the'frame or housing and the top of the mortise so that any pressure thrust upon the locking bar is transmitted therethrough to the stile, and does not come upon the pintle 16.

On the upper surface of crossbar or rail 19 above stile 21 of the lower sash (of which portions of the glass 20, and guides 22 are shown) is fastened an abutment lock or seat 23 with which the lower end of locking bar 15 cooperates to lock the sashes against vertical movement, a portion of the seat projecting beyond the cross-bar at 23*. Block 23 also has a projection 24 acting as a stop to limit the outward movement of bar 15 and its engaging eccentric curved surface 25, when in locking-position, is on a curve or incline falling inside an arc struck from the pintle 16 as a center as indicated by the dotted line, the divergence increasing from the rear toward the front of the block. The lower end of the bar 15 is similarly shaped so that the two come into locking engagement to some extent even though one or lower sash when the sashes are moved relatively to one another I provide another spring 29 secured to they housing at 30 having a tooth or lug 31 adapted to engage the front lowerlend of bar 15 when the latter is forced into its housing, and one or both of the sashes is open. A protruding end 32 of spring 29 is struck by the projecting portion 23 of block 23 when the cross bars or rails 11 and 19 are in the same plane, in other words when both sashes are closed, pressing the same downwardly and freeing the locking bar which immediately and automatically swings forwardly into engagement with block 23 and locking the sashes against relative sliding movement.

All of the above mentioned locking parts are desirably made of metal so as to possess suflicient strength to successfully withstand any prying or other force applied to the sashes. Any attempt to slide one sash relatively to the other when they are locked results in a transmission of the strain longitudinally of the locking means and stiles which manner of strain transmission affords much greater resistance to such action than constructions where such a strain is thrust transversely upon a sash locking mechanlSm.

Although I have shown my invention as applied to but one side of the window, it is evident that it might be duplicated on the other side, if desired; and it is also apparent that minor changes in the construction of the device may be made without departing from the substance of my invention as set forth in the following claims.

I claim:

In a sashlock, the combination of a looking bar pivotally secured in a mortise in a window sash, spring means tending to press the free end of said bar out of said mortise, and a block or seat mounted on the other sash in cooperative relation with the free end of said locking bar, the end surface of said bar and the coacting face of said block being eccentric to the pivot of said bar in the closed position of the sashes, substantially 

